I cannot figure out what is wrong with my admin interface

[jfb]

Dnsmasq does not run with Pi-Hole V4. The code is embedded in pihole-FTL, which runs in place of the dnsmasq process.
Pi-Hole debug log will show dnsmasq as either failed or inactive.

This thread may be related to your lighttpd problem:

Problem accessing admin page

Please follow the below template, it will help us to help you! Expected Behaviour: Problem accessing the admin page. Actual Behaviour: Can't get to the admin page, dnsmasq and lighttpd failed. Whenever I try to access it with http://pi.hole/admin or with the IP address, I get: "This site can’t be reached" refused to connect. ERR_CONNECTION_REFUSED Debug Token: 65a2ipjijb